opengl's Introduction
一、 这是一个用OpenGL绘制的能够显示当前系统时间的模拟时间。 二、 推荐使用Visual Studio运行该程序。 三、参考函数和相关知识 1)void myidle()//闲置响应函数 { //当时间闲置时系统要做的事 } 2)时钟相关知识 注意,把系统时间取出后,分钟应考虑秒钟的影响,时钟应考虑分钟的影响。例如: mm=mm+ss/60 hh=hh+mm/60 时、分、秒绘制: 关键是获取时分秒针终点的坐标。假设时针中心点(xc,yc),时分秒长度分别为RH,RM,RS 秒针终止点 xs = xc + RS* cos(PI / 2.0 - ss / 60 * 2 * PI); ys = yc + RS * sin(PI / 2.0 - ss / 60 * 2 * PI); 分针终止点 xm = xc + RM * cos(PI / 2.0 - (mm + ss / 60.0) / 60.0*2.0*PI); ym = yc + RM * sin(PI / 2.0 - (mm + ss / 60.0) / 60.0*2.0*PI); 时针终止点 xh = xc + RH*cos(PI / 2.0 - (hh + (mm + ss / 60.0) / 60.0) / 12.0*2.0*PI); yh = yc + RH*sin(PI / 2.0 - (hh + (mm + ss / 60.0) / 60.0) / 12.0*2.0*PI);
opengl's People
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